Abstract

The HELEN high-power Nd:glass laser has been rebuilt in a new multipass configuration that requires fewer components to maintain existing performance. This is expected to lead to greater system availability and reduced running costs. We describe the new design, discuss some of the key issues that had to be addressed, and present operational results.

© 2002 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
    [CrossRef]
  2. M. L. Andre, “Status of the LMJ Project,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 38–42 (1996).
    [CrossRef]
  3. R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
    [CrossRef]
  4. W. W. Simmons, R. O. Godwin, “Nova laser fusion facility: design, engineering and assembly overview,” J. Nucl. Technol. Fusion 4, 8–24 (1983).
  5. M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
    [CrossRef]
  6. R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).
  7. I. C. Smith, AWEple, Berkshire, United Kingdom (personal communication, 1996).
  8. J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
    [CrossRef]

1996

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

1983

W. W. Simmons, R. O. Godwin, “Nova laser fusion facility: design, engineering and assembly overview,” J. Nucl. Technol. Fusion 4, 8–24 (1983).

1981

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

Andre, M. L.

M. L. Andre, “Status of the LMJ Project,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 38–42 (1996).
[CrossRef]

Boni, R.

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

Boyes, J. D.

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

Craxton, R. S.

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

Godwin, R. O.

W. W. Simmons, R. O. Godwin, “Nova laser fusion facility: design, engineering and assembly overview,” J. Nucl. Technol. Fusion 4, 8–24 (1983).

Haney, S.

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

Harvey, E. J.

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

Henesian, M.

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

Hopps, N. W.

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

Jacobs, S. D.

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

Kumpan, S. A.

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

Lowdermilk, W. H.

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

Murray, J. E.

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

Murray, J. R.

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

Nolan, J. R.

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

Norman, M. J.

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

Paisner, J. A.

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

Rizzo, J. E.

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

Sacks, R.

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

Seppala, L.

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

Simmons, W. W.

W. W. Simmons, R. O. Godwin, “Nova laser fusion facility: design, engineering and assembly overview,” J. Nucl. Technol. Fusion 4, 8–24 (1983).

Smith, I. C.

I. C. Smith, AWEple, Berkshire, United Kingdom (personal communication, 1996).

Smith, W. F. E.

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

Sorem, M.

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

Speck, D. R.

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

Trenholme, J.

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

Van Wonterghem, B. M.

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

IEEE J. Quantum Electron.

R. S. Craxton, S. D. Jacobs, J. E. Rizzo, R. Boni, “Basic properties of KDP related to the frequency conversion of 1µm laser radiation,” IEEE J. Quantum Electron. QE-17, 1782–1786 (1981).
[CrossRef]

J. Nucl. Technol. Fusion

W. W. Simmons, R. O. Godwin, “Nova laser fusion facility: design, engineering and assembly overview,” J. Nucl. Technol. Fusion 4, 8–24 (1983).

LLNL Inertial Confinement Fusion Q. Rep.

R. Sacks, M. Henesian, S. Haney, J. Trenholme, “The PROP92 Fourier beam propagation code,” LLNL Inertial Confinement Fusion Q. Rep. 6, 207–213 (1996).

Other

I. C. Smith, AWEple, Berkshire, United Kingdom (personal communication, 1996).

J. E. Murray, B. M. Van Wonterghem, L. Seppala, D. R. Speck, J. R. Murray, “Parasitic pencil beams caused by lens reflections in laser amplifier chains,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, Proc. SPIE2633, 608–614 (1995).
[CrossRef]

M. J. Norman, E. J. Harvey, N. W. Hopps, J. R. Nolan, W. F. E. Smith, “Advanced pulse generator and preamplifier for the HELEN laser,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 114–120 (1996).
[CrossRef]

J. A. Paisner, J. D. Boyes, S. A. Kumpan, W. H. Lowdermilk, M. Sorem, “Conceptual design of the National Ignition Facility,” in Solid State Lasers for Application to Inertial Confinement Fusion (ICF), W. F. Krupke, ed., Proc. SPIE Vol. 2633, 2–12, (1995).
[CrossRef]

M. L. Andre, “Status of the LMJ Project,” Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, M. L. Andre, Proc. SPIE3047, 38–42 (1996).
[CrossRef]

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (10)

Fig. 1
Fig. 1

Schematic of the multipass HELEN laser.

Fig. 2
Fig. 2

Schematic of 50-mm rod amplifier stage of the multipass HELEN laser.

Fig. 3
Fig. 3

Schematic of the HELEN multipass disk stage with detail of the (a) TSF mid-section and (b) reverser stage.

Fig. 4
Fig. 4

Off-axis beam propagation for the multipass HELEN, illustrated for the rod amplifier stage.

Fig. 5
Fig. 5

Schematic of beam footprints on the four passes of the HELEN multipass disk amplifier stage as seen (a) in the 208-mm amplifiers and (b) at the TSF pinhole plane.

Fig. 6
Fig. 6

Process for generation of narrow pencil beams from the spatial filter lens ghost focus.

Fig. 7
Fig. 7

(a) Energy in versus energy out for the four-pass rod stage, (b) passes 1 and 2 of the disk amplifiers, and (c) passes 3 and 4 of the disk amplifiers.

Fig. 8
Fig. 8

(a) Near-field intensity profiles at the four-pass rod output, (b) reverser end mirror, and (c) system output. For comparison, (d) an output near-field profile from the old HELEN is also shown.

Fig. 9
Fig. 9

Equivalent plane focal spot images at the second harmonic (527-nm wavelength) for the HELEN multipass (a) east and (b) west heating beams and for the old HELEN (c) east and (d) west beams.

Fig. 10
Fig. 10

Three-dimensional representation of the phase profile of the HELEN multipass output beam (a) before and (b) after correction of the nitrogen gas-fill stratification problem. The top of the beam is at the bottom right. The full phase range is approximately eight waves.

Tables (2)

Tables Icon

Table 1 Performance Characteristics of the Single-Pass HELEN Design

Tables Icon

Table 2 Calculated Performance Envelope of the Multipass HELEN

Metrics